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以Q235钢片为基体,采用湿法超声机械镀制备Zn–Al复合镀层。用扫描电子显微镜及其配备的能谱仪分析了锌–铝复合镀层的表面形貌、断面形貌和元素组成,并用测厚仪、贴滤纸法和划格试验分别对镀层的厚度、孔隙率和结合力进行表征。结果表明,湿法超声机械镀Zn–Al复合镀层是由锌粉和铝粉颗粒相互镶嵌、填充所形成的致密堆积体,表面均匀、平整,与基体的结合强度高。镀层主要由锌、铝、锡和铁组成,铝的质量分数低于施镀前混合粉体中铝粉的质量分数。在考虑施镀过程中金属粉的损耗后,所得Zn–Al镀层的厚度满足预定的厚度(30μm)要求。
Q235 steel sheet as the base, the use of wet ultrasonic mechanical plating prepared Zn-Al composite coating. The surface morphology, cross-sectional morphology and elemental composition of zinc-aluminum composite coatings were analyzed by SEM and EDS, and the thickness, porosity and porosity And binding ability to characterize. The results show that the wet-process ultrasonic coating of Zn-Al composite coating is composed of zinc powder and aluminum powder inlaid with each other, filling the formed compact body with uniform and smooth surface and high bonding strength with the substrate. The coating is mainly composed of zinc, aluminum, tin and iron, the mass fraction of aluminum is lower than the mass fraction of aluminum powder in the mixed powder before plating. The thickness of the resulting Zn-Al coating fulfilled a predetermined thickness (30 μm) requirement after considering the loss of metal powder during plating.